Mobile first Mortgage Payment Calculator using Flexbox

What are you most proud of, and what would you do differently next time?

I think I got it pretty close to the design.

What challenges did you encounter, and how did you overcome them?

Doing mobile first is harder for me than doing it web first. I found that I had to re-do and go back to some css stylings I have already done to fix it.

What specific areas of your project would you like help with?

How can I make this more optimize in terms of repeating less code? What did I do that were not the best practice?